1668890717 has 12 divisors (see below), whose sum is σ = 1814387904. Its totient is φ = 1534338000.

The previous prime is 1668890701. The next prime is 1668890719. The reversal of 1668890717 is 7170988661.

It is not a de Polignac number, because 1668890717 - 2⁴ = 1668890701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668890719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22748 + ... + 62090.

It is an arithmetic number, because the mean of its divisors is an integer number (151198992).

Almost surely, 2^1668890717 is an apocalyptic number.

It is an amenable number.

1668890717 is a deficient number, since it is larger than the sum of its proper divisors (145497187).

1668890717 is a wasteful number, since it uses less digits than its factorization.

1668890717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39620 (or 39607 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 1668890717 is about 40852.0589077221. The cubic root of 1668890717 is about 1186.1582477355.

The spelling of 1668890717 in words is "one billion, six hundred sixty-eight million, eight hundred ninety thousand, seven hundred seventeen".